Trustee



L. GODDU. Nailing-Machine.

Patented Mar. 30,1880.

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UNITED STATES PATENT Trice,

LOUIS GODDU, OF WINCHESTER, MASSACHUSETTS, ASSIGNOR TO MGKAY METALLICFASTENING ASSOCIATION, (GORDON MGKAY, OF CAMBRIDGE,

MASSACHUSETTS, TRUSTEE.)

MAILING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 226,062, dated March30, 1880.

Application filed January 31, 1880.

To all whom it may concern:

Be it known that I, LOUIS GODDU, of Winchester, county of Middlesex,State of Massachusetts, have invented an Improvement inNailing-h/Iachines for Boots and Shoes, of which the followingdescription, in connection with the accompanying drawings, is aspecification.

This invention relates to nailing-machines for boot and shoe work, andhas special reference to mechanism for imparting to the driverbar itsquick downward motion.

The driver-bar in nailing-machines has heretofore been driven either bya spiral spring,

1 which surrounds the bar, or is inclosed in the long tube in which thedriver-bar is made to reciprocate, as in numerous patents of the UnitedStates heretofore granted to me, or by a flat spring of steel or wood.

In this my present invention I employ a torsional spring, one end ofwhich acts to instantly throw down the driveractuating arm whenever thedriver is released after being lifted, while the opposite end of thesaid spring is in contact with a holding stud or stop in anadjusting-plate, whereby the force of the spring may be adjusted atwill.

The employment of a short torsional spring, as herein described, enablesme to make the 0 working parts more compact, cheapen their construction,and add to the durability and efiiciency of the driver-actuatingmechanism.

Figure 1 represents, in side elevation, a suffioient portion of anail-driving machine to il- 3 5 lustrate my invention; Fig. 2, afront-end elevation thereof; and Fig. 3, a sectional detail showing thehubs or supports for the torsional spring, the position of the latterbeing denoted in part by dotted lines.

In the drawings, (6 is supposed to represent part of the usual guide, inwhich the driverbar is made to reciprocate, and b is supposed torepresent the upper end of the nail-driver bar, or a bar which rises andfalls in unison 5 with it.

The front end of the driver-actuating arm 0, having its fulcrum on thestud or axle d, rests upon the bar I), and is always kept in contacttherewith by the torsional spring e,

5c the end 3 of which bears upon the said arm or a suitable projectionthereof, as in Fig. 2, while the other end, 4, of the said spring bearsagainst an adjustable holding stud or stop, f,

on an adjusting-plate, g, having a series of holes, openings, orreceivers, 5, for receiving the said stud f when it is desired to changeI the stress of the said spring 6.

The plate g has a hub, S, to support the interior of the spring 6, andthe arm 0 has also such a hub, 0

In practice, the driver bar will be lifted against the action of thespring 6 by a cam on the main or other shaft of the machine, all in theusual manner, such devices being herein omitted, as they form no part ofmy present invention; but as soon as the driver-bar lifting-cam comes inposition to permit the driverbar to descend, the spring 0, acting on thearm 0, causes it to instantly descend, the force, of the blow being moreor less, according to the adjustment of the said spring.

It is obvious, instead of moving the pin f in the plate g, that I mightso connect the said plate with the stud or axle d as to adjust itaxially upon the said axle, holding it in adjusted position by means ofa set-screw or otherwise.

The end coils of spring 6 surround the hubs 8 and 0 but the main part ofthe interior of the spring, being unsupported, is left free to expand orcontract by tension without loss of power or force, as would be the caseif it were supported at its center by a tube or barrel extended throughand filling it.

I claim 1. In a nailing-machine, the driver-actuating arm and thetorsional spring, combined with the pin or stop, and adjusting devicesto control and regulate the force of the said spring and the blow of thedriver, substano tially as described.

2. In a nailing-machine, the combination, with the arm 0 and its hub,the short hub 8, and spring-holder, of the torsional spring 0, supportedonly at its ends, substantially as 5 described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

LOUIS GODDU.

Witnesses:

G. W. GREGORY, N. E. O. WHITNEY.

